Abstract

able to preserve death diatoms in the sediment for long periods of time, therefore,
diatoms have an important role in the paleolimnological analysis. Diatoms
assemblages in the sediment layer express the water quality whenever the diatom
lives. This article provides information how to apply diatom on the paleo-limnological
analysis, supporting with the case study in the Lac Saint-Augustine Quebec-City
Canada and Rawa Pening Lake Indonesia. Modern diatom and the water quality
from spatial and temporal range are used as a calibration set. The diatoms of below
layers, then, Weighted Averaging (WA) with the calibration set to reconstruct the
water quality in the past. Previously, both in Canada and Indonesia, those lakes were
oligotrophic and sharply change into eutrophic condition since a lot of human
activities developed around the lakes (anthropogenic factors). Naturally, the maturity
of lake can not avoid and the succession had been fast by eutrophication.
Paleolimnological approach provides baseline data in the past to develop the
appropriate lake management.